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Answer :
The correct option which would decrease the margin of error is Option B.
The margin of error is inversely proportional to the square root of the sample size. This means that increasing the sample size will decrease the margin of error.
Constructing a 90% confidence interval will increase the margin of error, and constructing a 95% confidence interval will increase the margin of error even more. This is because a higher confidence level requires a wider confidence interval.
Therefore, the correct option is using a sample size of 200.
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